2/5 (x+1) = G, find x
in order to find x you must multiply through the fraction on the left hand side so:
--- x + --- = G
I know you don't want me to solve it for you so the next step would be to manipulate the equation so that x is the only thing on the left hand side and G and all numbers are on the right hand side.
The next step I would do is multiply everything by 5 and you can take it from there.